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TI-2026-51617 Aliases CVE-2026-73507GHSA-v74w-7mr3-4qg3

Netty: Denial of Service in XmlFrameDecoder via CPU Exhaustion

Priority MEDIUM 40CWE-400Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
Partial Red Hat: 1 fixed, 1 without a fix

Attack profile from CVSS 3.1 · CNA. Fix status from CNA, GitHub and Red Hat. Impact type from CWE-400.

Summary

Netty is an asynchronous, event-driven network application framework. Prior to 4.1.136.Final and 4.2.16.Final, io.netty.handler.codec.xml.XmlFrameDecoder.decode() failed to preserve closing-tag parser state across invocations, so an unauthenticated remote attacker could trickle-feed repeated </ sequences that repeatedly rescanned the accumulated buffer and exhausted an EventLoop thread's CPU, causing denial of service with a maxFrameLength of 1 MB. This issue is fixed in versions 4.1.136.Final and 4.2.16.Final.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00793 56th percentileScored 2026-11-07
Fix Partial netty (netty): 4.1.136.Final, 4.2.16.Finalio.netty:netty-codec-xml (Maven): 4.2.16.Final, 4.1.136.FinalRed Hat: 1 advisoryRed Hat: 1 fixed, 1 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
nettynettybefore 4.1.136.Final; 4.2.0.Final to before 4.2.16.Final4.1.136.Final, 4.2.16.FinalPatch availableCNA
—io.netty:netty-codec-xml (Maven)4.2.0.Final to before 4.2.16.Final4.2.16.FinalPatch availableGHSA-v74w-7mr3-4qg3
—io.netty:netty-codec-xml (Maven)before 4.1.136.Final4.1.136.FinalPatch availableGHSA-v74w-7mr3-4qg3
  • netty Vendornetty Affected before 4.1.136.Final; 4.2.0.Final to before 4.2.16.Final Fixed in 4.1.136.Final, 4.2.16.Final Patch available CNA
  • io.netty:netty-codec-xml (Maven) Vendor— Affected 4.2.0.Final to before 4.2.16.Final Fixed in 4.2.16.Final Patch available GHSA-v74w-7mr3-4qg3
  • io.netty:netty-codec-xml (Maven) Vendor— Affected before 4.1.136.Final Fixed in 4.1.136.Final Patch available GHSA-v74w-7mr3-4qg3

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:netty:netty:*:*:*:*:*:*:*:*before 4.1.136; 4.2.0 to before 4.2.16Vulnerablenetty
  • cpe:2.3:a:netty:netty:*:*:*:*:*:*:*:* Versions before 4.1.136; 4.2.0 to before 4.2.16 Vulnerable ·netty

Remediation

  • Fix · CNA netty (netty) Fixed in 4.1.136.Final, 4.2.16.Final
  • Fix · GHSA-v74w-7mr3-4qg3 io.netty:netty-codec-xml (Maven) Fixed in 4.2.16.Final Advisory →
  • Fix · GHSA-v74w-7mr3-4qg3 io.netty:netty-codec-xml (Maven) Fixed in 4.1.136.Final Advisory →

Red Hat 1 advisory

  • RHSA-2026:71675 Released 2026-09-24 · Red Hat rating Important
    Red Hat Build of Apache Camel 4.18.4 for Spring Boot release.
    • Red Hat build of Apache Camel 4.18.4 for Spring Boot 3.5.16

Vendor assessments

Red Hat

Red Hat rating: Important. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Single Sign-On 7AffectedNo fix planned: Will not fix
Red Hat build of Apache Camel 4.18.4 for Spring Boot 3.5.16Fixed RHSA-2026:71675
Not affected: 1 product
  • Red Hat JBoss Enterprise Application Platform 7

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-73507
  2. 2026-10-03 Alias added: GHSA-v74w-7mr3-4qg3
  3. 2026-10-16 Affected versions changed · Red Hat

References

Patch 2

Advisory 1

Other 5

  • TI-2023-23979 The HTTP/2 protocol allows a denial of service (server resource consumption) because… KEVCVSS 3.1HIGH 7.5
  • TI-2026-30861 Netty: HTTP/1.0 TE+CL Coexistence Bypasses Smuggling Sanitization CVSS 3.1CRITICAL 9.8
  • TI-2026-30864 Netty: HttpClientCodec response desynchronization CVSS 3.1CRITICAL 9.1
  • TI-2026-30859 Netty: DNS Codec Input Validation Bypass in Netty (Encoder + Decoder) CVSS 3.1CRITICAL 9.1
  • TI-2026-40973 Netty: Missing CertificateID Validation in OCSP Response Allows Replay Attacks CVSS 3.1CRITICAL 9.1
  • TI-2026-40972 Uncontrolled resource consumption in netty CVSS 3.1HIGH 7.5
See all 92 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences